LCD screen is garbaged.
Try to connect the LCD screen to an external monitor. If the external video is fine, you have a problem with the LCD screen or the LCD video cable. You can try to fix the problem by reseating the video cable on the back of the LCD and on the system board.
If you see the same garbaged video output on the external monitor most likely it is not the LCD screen problem. In this case the system board (with onboard video) is bad or the video card is bad.
I understand
that these tips will not cover all video problems with portable computers. If
you have a different problem, you are welcome to leave a comment and I will try
to help you if I can.